JPH04447B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for manufacturing a laminate that is widely used as an electrically insulating material and the like. (Prior Art) Conventionally, laminates such as synthetic resin laminates have been produced using prepreg 1, which is made by impregnating and drying a base material such as paper or glass cloth with phenol resin, epoxy resin, polyimide resin, etc., as shown in Fig. 2. Stack the number of laminates according to the required thickness, and if necessary, further stack copper foil on the surface and sandwich it between 2 metal plates (hereinafter referred to as mirror plates) made of stainless steel or the like with a thickness of 1 to 3 mm.
The assembly is conveyed via a cushion 3 made of kraft paper, a composite of a rubber plate and cloth, a rubber plate, etc., and placed on a carrier plate 4, which is a metal plate, to form a laminate as shown in FIG. It is manufactured by heating and pressurizing it by placing it between the hot discs of a compression press for molding. In Fig. 3, 5 is the upper plate, 6 is the column, 7 is the movable plate, 8 is the fixed part, 9 is the cylinder, 10 is the oil chamber,
11 is an oil tank, 12 is a vibrator, 13 is a pump, 14
is a hot plate. The laminated material 1 is placed between the hot platens 14 while being placed on the carrier plate 4. 15 is a backing plate made of the same material as the carrier plate, such as iron or copper;
Reference numeral 16 denotes a cushion, which is configured to be vertically symmetrical within the heating plate 14. The upper plate 4 has a support 6 attached to the fixed part 8.
The hot plate 14 and the movable plate 7 are supported and fixed by the pillars so as to be movable up and down, and the movable plate 7
By pressurizing oil into the oil chamber 10 by the pump 13, it is pushed upward along with the movement of the cylinder 9. According to the movement of the movable plate, the hot plate 14 is also pushed upward, and the laminated material is compression-molded between the fixed upper plate 4 and the movable plate 7. The heat required during compression molding is supplied by flowing steam into a pipe (not shown) embedded within the heating platen. (Problems to be Solved by the Invention) The cushion 3 is used to equalize pressure and temperature, but it gets fatigued from repeated stress due to the edge of the end plate, and has a long life of 500 cycles. In addition, in some cases, the thickness distribution of the cushion is non-uniform, resulting in a decrease in the thickness accuracy of the laminate and occurrence of scratching defects. Additionally, the use of cushioning material reduces thermal conductivity. The present invention has been made in view of these points, and it is possible to reduce the accuracy of the thickness of the laminate due to uneven pressure being applied to the laminate material such as prepreg, and to reduce defects due to scratches. The present invention provides a method for manufacturing a laminate that does not generate such problems. (Means for Solving the Problems) As shown in FIG.
A carrier plate 25 having a pressure medium layer 24 covered with an elastic membrane 23 is interposed between the laminate material 21 and an end plate 22 that sandwich the laminated material 21, and compression molding is performed by applying pressure to the pressure medium layer. be. 26 is a backing plate, made of the same material as the carrier plate,
It is used to ensure that heat is transferred to the laminated material from above and below at the same time. The structure of the carrier plate is shown in Figure 1b. The carrier plate includes a base plate 27 having a shallow recess on its surface;
It consists of a pressure medium layer 24 housed in a concave portion of the base plate, a seal plate 28, an elastic membrane 23, a clamp 29 for holding down the sealing material and the elastic membrane, and a bolt 30 for holding down the clamp. The base plate may be made of general structural rolled steel, and the plate thickness is generally 4 to 12 mm, but for convenience of loading and unloading, and to prevent warping of the base plate from repeated thermal stress, it is recommended to use a thickness of 5 to 9 mm. good. The depth of the recess is 0.5 to 5 mm, preferably 1 to 2 mm.
mm. Mineral oil, as pressure medium introduced into the recess
Water, magnetic fluid, heat-resistant liquid synthetic resin, liquid halogenated hydrocarbon, etc. are used. Hydrocarbon-based lubricating oils with good thermal stability at high temperatures, non-corrosive to metals, and excellent heat transfer are desirable commercially available oils, such as Neo SKoil.
#170, #240, #L-400 (product name manufactured by Soken Chemical Co., Ltd.)
There is. The recess is provided with an inlet for pressurizing the pressure medium and an outlet for discharging the pressure medium (not shown). Even without providing an injection port or a discharge port, the pressure required for compression molding can be obtained by enclosing a pressure medium in the recess and volume expansion due to heating. As a sealing material, silicone rubber or fluoro rubber O-rings are good when the heating temperature is 100 to 200°C, and if the heating temperature is higher than that, a molded product made of graphite is good. If the pressure applied to the pressure medium layer exceeds 100 kg/cm ² , apply a back-up seal to the O-ring surface (process the elastic membrane surface facing the O-ring into a shape that follows the outer shape of the O-ring). As the elastic membrane, rubber sheets with excellent heat resistance and oil resistance, such as fluorocarbon rubber sheets, are often used.Commercial names include Viton (trade name, manufactured by Showa Neoprene), Florail (trade name, manufactured by Sumitomo 3M), and Daiel (trade name, manufactured by Daikin). (name), Aflas (product name manufactured by Asahi Glass Co., Ltd.), etc. If necessary, thin metal foils such as copper, stainless steel, etc. may be used on the bottom and top surfaces of the rubber sheet, and glass fiber cloth layers, Teflon glass fiber cloth, etc. By using a structure in which layers are formed and combined, the service life will be extended. Although a gold layer thin plate can also be used, it is preferable that the metal thin plate has good elasticity and thermal conductivity, and the material used is general structural rolled material or stainless steel. The plate thickness is preferably 1 to 4 mm, and optimally 1.6 to 2.2 mm. The material of the clamp may be a general structural rolled material, but it is even better if it has high tensile strength and yield point, such as carbon steel for machine structures. The plate thickness is determined by the material and the pressure of the pressure medium. For example, with SS41 material, the pressure medium pressure is 140
For Kg/cm ² it is 9mm, and for S45 it is 6mm. The pressure medium is interposed over the entire surface of the laminated material. However, no pressure medium may be present at the ends of the laminated material. The area where no pressure medium is required is within 5 cm of the end of the final product, preferably 2 to 2 cm.
It is about 3cm. The pressure medium can be interposed not only on the lower surface of the mirror plate but also on the upper surface. A heating plate 20, which is a pressurizing plate, holds the laminated material sandwiched between mirror plates.
The structure placed on top of is multi-staged as shown in Figure 4.
For example, compression molding is performed by stacking 10 to 100 stages or several hundred stages. In Figure 4, 20 is a heating plate, 31 is an upper plate, 32
is a movable plate, and the upper plate 31 is fixed to a fixed part 34 by a support 33, but the movable plate 32 moves upward. The heating platen 20 is movable upward as the movable plate 32 moves upward, but a stopper is installed to prevent each heating platen 20 from falling below a certain position when the movable plate 32 is at the lowest position. is attached to the support column 33 (not shown). Between the hot plates 20,
In the configuration shown in FIG. 1, a mirror plate laminated material, a pressurizing medium, etc. are placed, and the hot platen 20 is pushed up by the movable plate 32, so that the hot platen, the mirror plate, and the laminated material are brought into close contact with each other. At this time, the pressure applied to the laminated material is a contact pressure (0) to 10 kg/cm ² . The movable plate 32 is moved by a gear, a cam, a toggle, a hydraulic cylinder, etc. to bring the heating plate, mirror plate, and laminated material into close contact with each other. It is also possible to sandwich a hot plate, a laminated material, and a mirror plate between the upper mold and the lower mold and bring them into close contact by their own weight. At this stage, the distance between the upper plate and the movable plate is fixed. Thereafter, as shown in FIG. 1, pressure required for compression molding is applied by injecting a pressure medium into the pressure medium interposed between the hot platen and the end plate through a communicating pipe. Pressure can also be applied by thermal expansion of an enclosed pressure medium. The pressure applied to the pressure medium is, if the laminated material is prepreg,
For phenolic resin, 40-150Kg/ ^cm2 preferably 60
~100Kg/cm ² , 5 to 100Kg/cm ² for epoxy resin, preferably 20 to 80Kg/cm ² , 5 for polyester resin
~100Kg/cm ² , 10-100Kg/cm ² for polyimide resin
is good. Depending on the type of laminated material, pressures of several 100 kg/cm ² can be used. The present invention is a method in which the compression force applied to the laminated material for compression molding is applied to the pressurized medium interposed in the hot plates and head plates of each stage, and the hot platen, the head plate, and the laminated material are closely fixed to each other. Because of this, the amount of pressure medium such as oil for pressurization is not only small, but also
It is extremely easy to control the pressure to quickly apply the required pressure to each of the multiple stages, and it is easy to apply uniform required pressure to all stages. Also, pressure is applied to the pressure medium for a certain period of time (for example,
(about 10 seconds to 60 minutes) Heat and pressurize the laminated material, then
Pressurization, which involves depressurizing the pressure medium for a certain period of time (for example, about 10 seconds to several minutes) and then adding pressure to the pressure medium.
It is also possible to pressure-form a laminated material by repeating depressurization and release. In such a case, the present invention allows pressure changes to be controlled quickly and uniformly. The temperature required for compression molding is preferably 150°C to 200°C for phenolic resins and epoxy resins, and 180°C to 250°C for polyimide resins. Laminated materials include prepreg, SMC, which is made by impregnating and drying base materials such as paper and glass cloth with synthetic resin varnish such as phenol resin, epoxy resin, epoxy resin, polyamide resin, and silicone resin.
Metal plates, sheet-like essential materials, green sheets, constituent materials of multilayer wiring boards, etc. are used. The constituent material of a multilayer wiring board is to stack one or more inner layer circuit boards on which a necessary circuit pattern is formed on one or both sides of an insulating substrate via a prepreg, and then to form a single-sided or double-sided circuit board via a prepreg. , single-sided copper foil clad laminate, and copper foil laminated. The single-sided circuit board and single-sided copper foil-clad laminate placed in the outer layer are arranged so that the circuit-formed side and the copper foil side are on the outside. The temperature required for compression molding may be provided by, for example, hot air, infrared rays, etc., in addition to the method of supplying from a heating platen, and a mere pressure plate may be used instead of the heating platen. (Effects of the Invention) As explained above, in the present invention, the following effects are achieved. (1) Pressure is more uniform than when cushioning material is used. As a result, the rate of defects caused by uneven pressure is reduced. (2) Eliminate cushioning material. Example: In the production of paper phenol copper-clad laminates, the manufacturing conditions were a pressure of 120 kg/cm ² , a heating temperature of 180°C, a heating and pressing time of 30 minutes, and a carrier base plate (material SS41, plate thickness 9 mm) using a fluid film. (Fluid heat transfer oil, film thickness 1.0 mm), sealing material (“O” ring silicone rubber diameter 7 mm), clamp (Material SS41, plate thickness 9
mm), bolt (M12, hexagonal bolt with socket, bolt pitch 50mm), fluid film cover (SUS304, 2mm),
The pressure was equalized and a product with good appearance and thickness was obtained. Table 1 shows a comparison between the case where the oil film carrier plate of the example was used and the case where a conventional rubber cushion was used.

【table】

【table】 [Brief explanation of drawings]

FIG. 1a is a sectional view showing the method of the present invention, FIG. 1b is an enlarged sectional view of the carrier plate, FIG.
Figure 3 shows the conventional method, with a sectional view and a cross-sectional view, respectively.
FIG. 4 is a partially cutaway side view illustrating the method of the present invention. Explanation of symbols, 20... Pressure plate, 21... Laminated material, 22... End plate, 23... Elastic body membrane, 24...
Pressure medium, 25...carrier plate.

Claims (1)

[Claims] 1. In the method of manufacturing a laminate in which a laminated material is sandwiched between two end plates, inserted between two pressure plates, and pressed from the outside of the end plate under heating, there is a A carrier plate having a pressure medium layer covered with an elastic membrane on one side is interposed, and a laminated material,
A method for manufacturing a laminate, which comprises: bringing a mirror plate, a pressure plate, and a carrier plate into close contact with each other, fixing the interval between the pressure plates, and then applying pressure necessary for compression molding the laminate to the pressure medium layer.